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Breakdown of Er weiß es und er ist unglücklich.
ist
is
und
and
er
he
unglücklich
unhappy
Like in English, adding un- negates the adjective. However this doesn't work with all adjectives...
es
it
wissen
to know
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“How do German cases work?”
German has four grammatical cases: nominative (subject), accusative (direct object), dative (indirect object), and genitive (possession). The case determines the form of articles and adjectives. For example, "the dog" is "der Hund" as a subject but "den Hund" as a direct object.
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